simpson



MMcSS S D. B. SIMPSON.

AUTOMOBILE ALARM LOCK.

APPLICATION FILED APR. 1. 1919 1,321,854. Patented N0v. 18,1919.

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r EE E IIIIIINIIIIIIIM ATTORNEY D. B. SIMPSON.'

AUTOMOBILE ALARM LOCK.

APPLICATION FILED APR. 1, 1919.

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l N VEN TOR ATTORNEY W; Tn e 5965 Patented N0v.'18, 1919.

N E TA s P F E- H :navn) 1B. smrsomor wionrra, KANSAS.

nuroivioiarnnananlvr-nocn- To all whom. it may concern; 1

Be it known that 1, DAVID B. SIMPSON, a citizen of the United States, and resident of Wichita, in the county of Sedgwick and State of Kansas, have invented certain new and useful Improvements in Automobile Alarm-Locks, of which the following is a description, referring to the drawings accompanying this specification.

My invention has for its object to provide means for locking an automobile in such a manner that not only will it be impossible for a thief to drive it away but that an alarm will be given as a signal that a theft is being attempted. The above objects are accomplished by the employment of the exhaust gas which under certain described conditions will counteract the engine compression, adulterate the new supply of gas, so as to annihilate its explosive force, and at the same time operate an alarm whistle. The conditions, means and methods by which the foregoing is attained is described in detail with reference to the accompanying drawings, in which;

Figure 1 is a longitudinal sectional View of the preferred form of mechanism for ac complishing the purposes of my invention.

Fig. 2 is a cross-sectional view taken along the line A-A Fig. l and looking in the direction of the arrows.

Fig. 3 is a side elevation of the front part of an automobile with parts removed to dis close the preferred installation of my locking device.

Similar numerals of reference indicate corresponding parts in all the figures of the drawings.

Referring to the drawings, B represents the exhaust pipe leading from the engine. G is an arched connection interposed in the exhaust pipe line B and carrying the looking and alarm device as later described. The exhaust pipe B and the connection C are each threaded in manner illustrated at T and U Fig. 1 and are assembled in the manher of pipe fittings.

The connection C is provided with an upper threaded collar Z into which a threaded cylinder D is screwed. The central plug D, seen projecting upwardly from the base of cylinder D, provides a shaft bearing D" within which a shaft E is adapted to slide. A valve H is pivotally hinged at V to the base of shaft E while the upper end of shaft E terminates in a head E. Surround- Specificatiomof LettersPatent. it .Pate ted N 18,1919, Application filiillbiillllflb. seriarn .esaesaf a collar WV andthe spring l hsurrounding the plug D and bearing against the base of cylinder D normally tendsto push the col lai' W upwardly thus forcing head E and shafts E to rise.

A look G slidab-ly housed within the bore of cylinder D is recessed at its base to admit the head E and above which is introduced aspring P. A cap L, screwed on the upper end of cylinder D to prevent dust from getting into the working parts, is removed when the lock G is to be operated.

The lock G is provided with a. spring catch M which catch can be released in any well known manner, such for instance as by a key operating as in a Yale lock; the catch M normally tending however to spring outwardly to engage a shoulder N formed in the wall of cylinder D. This locking engagement is effected when the lock G stands in the position seen in Fig. l for the purpose further explained.

If the catch M is released, the spring F will then force collar V, lock G and allied parts to rise as illustrated by the dotted positions F, W, G, M, this movement disengages the valve H from'contact with the port opening Q, Q formed in the bore of the arch connection G; the pivoted valve 'l-I then seating at the port R, R in the base of the cylinder D or as illustrated by the dotted position H. When this latter condition obtains, a free passage for the exhaust gases from the engine through the open port Q, Q will permit the engine and therefore the automobile to operate in the customa-ry manner. i

It being desired to lock the automobile, the driver removes the cap L and pushes the lock G downward from the dotted position G, seen in Fig. 1 so that the latch M engages shoulder N the pivoted valve H, assisted by pressure exerted by spring P, closes the exhaust port Q, Q. A small duct J, in the wall of cylinder D, leads from the port R, R and opens into the whistle K, screwed into the side wall of cylinder D as illustrated; it is obvious that should the engine now attempt to operate, that the back pressure produced in the exhaust line will seek to escape through this duct J, whereby the whistle K will be blown as a warning that a theft is being attempted. Should a thief remove the outer exhaust pipe B at T, the. arched shape of the connection 0 Q V I 1,321,854

interposed in the exhaust pipe line of a gas engine an arched'pipe connection having a port formed Within the bore of said connection" between the arch thereof and the point of union of sald connection with the exhaust plpe lead ng from said engine, a

cylinder having its base screwed into a ('01- 15 lar opening through the side of said arched connectlon and adJacent said port; a whistle engaging Without the cylinder, an exhaust duct communicating between said Whistle and a recess in the body base of said cylin- -der forinedas a port; and a valve adapted c to seat alternately against said ports for the "purposes specified.

DAVID B. SIMPSON.

'lvitnesses U. G. CHARLES, W. A. Nn'rnnnoo'r. 

